Means for controlling driving motors



Paul Weiske,

Jan. 25 1927.

l,6l5,665 P. WEISKE MEANS FOR CONTROLLING DRIVING MOTORS Filed July 9, 1925 4 Sheets-Sheet 2 Inventor: Paul Weiske,.

' His Attorng.

mfgzi i 1513365 P. WEISKE MEANS FOR CONTROLLING DRIVING HOTORS Filed July 9, 1925 4 Sheets-Sheet 5 Inventor Paul. WeLske y H Ls Attorny Jan. 25 1927. l,615,665

P. WEISKE JIEANS FOR CONTROLLING DRIVING MOTORS Filed July 9, 1925 4 Sheets-Sheet 4 Invntor: Paul Weiske,

His Attorney.

Patented Jan. 25, 1927.

UNITED STATES PAUL WEISKE, OF BERLIN, GERMANY, ASSIGNOB TO GENERAL ELECTBIC COMPANY,

A CORPORATION OF NEW YORK.

MEANS FOB CONTROLLING DRIVING MOTOES.

Application filed July 9, 1925-, Serial Ko. 42,589, and in Germany July 11, 18%.

My invention refers to means for controlling and regulating the operation of electrically driven machines and apparatus of all kinds in such a manner as to ob'tain synchronism of a number of such machines or apparatus or to cause them to run or be operated at a predetermined speed.

It more particularly concerns the case in which a machine designed for roducing a product of some or other kind s composed of several units or groups which are not rigidly connected with each other and which 'it is nevertheless desired to control so as to obtain synchronsm or running at different predeternined speeds; p

For instance a paper making machine consists of several sets of apparatus not rigidly interconnected and each of which has a driving motor of its own. The driving shafts of the difierent units are designed to be adjusted for different relative speeds which must be maintained automatically 'by separate regulating devices. As' a rule such regulating 'devices are based on a mechanical or electrica] diflerential eflect, one half of the difierential being moved in denendeney upon the speed of rotation of the shatt to be controlled, while the other 'half is moved in dependency upon the speed of one of the other driving shafts or with a separate controlling speed and, when the predetermined ratioof'speeds is not maintained, will adjust r throw in and out a regulating resistunce. The 'atio of speeds can be adjusted by varying the ratio of transmission between one half of the difl'erential and the shuft appertaining to it. In many cases small pairs of conical discs with shit'table belts are employed for this purpose.

In the installations hitherto in use these regulating devices are mounted on the driving side of. the machine in close proximity to the respective driving motors, which means that they are spaced apart relatively great di stances. In order to attend the regulating' devices the attendant must pass to the driving side of the machine or else se :n'ate means must be provided for t'ansmttng power from the attendant's stand to the driving side. It is however desirable that all the regulating devices can be manipulated in the simplest possible manner and are always easily accessible and can easily be observed by the attendant.

Fig. l is a plan View and Fig. 2 an eleva- -tion llustrating one modification.

F ig. 3 is a lan View showing an installation in Whic the mechanical differential gears shown in Fig. 1 are replaced by electrical regulating means.

Figs. 4 and 5 are an elevation and plan view respectively of the installation provided with means for a remote electric control of the regulating devices.

Fig. 6 is a diagram of connection appertaining thereto.

Referring first to Figs. 1 and 2, S is a rotary disc, the speed of rotation of which represents the controllng speed. This disc can be driven either by one of the' driving shafts or by a separate motor L. The disc -drives fricton discs r r 1- r mounted on shafts which are resiliently supported at one end, these shafts transmtting power unto one half of the diflt'erential gears d d d ah. ap ertaining thereto. The other half of the di erential gears is driven each by a small electromotor m m m m the speed of these motors being dependcnt upon the speed of rotation or upon an elcctric function of the respective driving motor M M M M mounted on one of the units forming the machine proper. Provided that the distance of all friction discs r 7- r n, from the axis of rotation of disc S be the same, then the wheels of the difi'e'ential gears coupled ,with the friction discs will rotate with equal speed. If the other wheels of the differential gears, which are driven in the opposite direction by the motors m m m m rotate at the same speed then the spindles of the intermediate wheels of the different-mi gears will remain stationary.

If, however, the difl'erential Wheels driven by the motors m m m m rotate at n greater or smaller speed than the diiierential wheels connected with' the friction discs 73, 1' ;1 n, and driven by disc S, the spindles of the intermediate wheels will be turned in one or the other sets and this turnine movement is transmitted in a manner well known per se by way of the movable casing of the dit ferential gear and by means of; toothed wheels or chains or in some other nanner to the contact crank arms of the field regulators R R R R whereby the field of the motors M M M M is weakened or strengthened and synchronisn of these motors is thus brought about.

If, as required for instance in paper making machines the motors M M M M, are required to rotate with ditterent speeds, the predetermincd relative ratio ot speeds being' however required to he automatically maintained, theu the distance of the friction discs 73, r 73 72 from the axis of disc S need merely be varied, whereby the speed of rotation ot the motors M M. M M is ger-- erned as desired.

The speed control can be obtaned in a Simpler and more advantageous manner lt" the mechanical differential gears mentioned above are replaced by electrical regulating' means which are also set Operating by differences of speed.

An installation ot this latter kind is illustrated in Fig. 3. In this installation no separate altcrnatine or three-phase current motors 772 772 m m are required, such as are provided in the installation illustrated in Fiq. 1 for transmittinr the speed of the driving motors M M M M to the corresponding members of the mechanical differeutial gears. In consequence thereof also the means required for feeding the motors m m m t m such as tor instance tappings or" the motors M M M M and separate current generators coupled therewith can be dispcnsed with.

Each half ot the ditterential regulating devices illustrated in Fig. 3 consists of a collector 7 la k and 76' k' 7c' 7c' respectively. the current conducting se& ments of which are connected with a slip rin s s. s 8 and s' 5 s' s' respectively. The contact brushes acting on the eolleclors ot the two halves of the differential are interconnected by wires. Synchronism ot the eollectors 73 73. k, e and 7c' ku, is etl eeted thereby so that whenever the ratio of speeds predetermined by adjusting the friction discs 7 7' 7' 7 'is disiurhed. the excitation ot the motors M EL; NL. is varied by throwin: in or Sli(?1'l'-(`ll`(`1llhll1 l the resistances lV M li therehy regulating the speed ot rotation ot the motors in dependency upon the speed of rotation ol the disc nasmuch as the two halves of the di'ti'erential are connected with the brushes mere ly by the wires they may be spaced apart any desired distance and it is thus rendered possible to operate each halt directly from the. working motors without ::ny transmis'- sion mechanism being inserted between them, whereby the installation as a whole 'i-'s rendered Simpler and more exact. in operation.

Obviously the arrangement above de scribed can be used in all other cases where the variation of the relative ratio of speeds is efi ected by means ot' conical trietion gears.

The variation of the ratio of speeds of thc single driving shat'ts by displaoing the frietion discs r relatively to disc S can either be eltected by' hand-by means of .levers or spindles and hand wheels or else by remote control with the aid ot press buttons mounted on the attendants stand or at other suitable points.

e l`his is illustrated by way of example in Figs. l ti, where S is the disc governing the lriction discs or rollcrs r 7' 73, u, and L is an electron'otor driving disc S. 'The frietion discs r 75, r 7' are displaced by an auxiliary motor 7 which connected with these discs or rollers by means of a shatt extending in the axis of disc S, suitable bevel gearings,' -elements t Z 25 25 and spindles 'MD a 10 u Between these spindles u u andthe elements t t t t is inserted a disengageable clutch which is influenced by'controlling magnets g g ln order to displace the triction discs or rollers 7 72 71 7 the motor i and the con trollin magnet of the respective frictior. dise must be th own in. Those friction discs. whose controlling magnet is not excited, are not displaced. If all the magnets are excited simultaneously. all the discs can he displaced unitormly. Means can, however also be provided for controlling the motor and the magnets by means of a switch for each magnet, such switch having two switch positions, in one of which it excites only the controlline magnet appertaining to it, while in the other position it excites this magnet and at the same time also all other controlling nagnets.

' An arrang'ement ot' this kind is illustratel in Fig. (i, where v is the auxiliary notor tor displacing the friction discs or roller-s. switches (1 a a being' provided tor connccting this motor with the three-phase sys tem 1, 2, 3. g g q are the windinqs ol' the controllin: magnets which can also be connected with the three -phase system by way of the switches a a u Each switch comprises a single switch shown on the righthand side, a group switch shown on the lefthand side, and the lockinn contacts 6 e 7). 6 b e shown farther below. These contacts are so arranged that when the single switches are moved to the left or all the group switches to the right, the contacts c ot the respective switch are opened while when the single switches are moved to the right. and the group switches to the left, the contacts 7 ot the respective switch are opened.

The single switch and the group switch are so locked relative to each other that, if one of them is thrown in, the circuit of the other is interrupted.

For instance if the single switch of switch a is moved to the left, at first the controlling magnet q, is excited on the following way: From the phase 2 of the three-phase system through wire 4, 'contact 5 and wires 6, 7, 8 to the phase 1. At. the same tome motor e is for instance thrown in clockwse, the phase o, being connected through wires 7 and 8 with the phase 1 of the system. The phase e, is connected with the phase 2 of the system through wires 9, 11, contact 24, wires 40, 48, upper looking-Contacts b upper lockingcontacts b uppcr locking-contacts 7). The phase u., is connected to the phase 3 of the system through wires 52, 54, contact 27, wires 41, 49, lower locking-contacts b lower locking contacts b lower looking contacts ?2 If the single switch of switch a, is moved to the right, the controlling magnet q, is again thrown in. The flow of current is substantally the same as before, however, connection betwen the wires 4 and 6 is not made by way of contact 5, but by way of contact 56. At the same time the phase Contacts t and v, of the auxiliary motor e are exchanged with regard to the connection previously described and in consequence thereof the motor now rotates in the opposite direction. The phase i), is connected with the phase 3 of the system through wires 11, contact 25, wires 43, 51, lower looking-contacts e lower looking-Contacts 0 lower locking-contacts 0,.

The phase v is connected with phase 2 of the system through wires 52, 54, contact 26. wires 42, 50, upper lockingcontacts c upper lookingontacts 0 upper looking-contacts 0,.

If, while the single switch of switch a is thrown in on the righthand side, the single switch of switch a, was also thrown in on the righthand side, the controlling magnet g, would be excited through wires 57, T, 8. At the same time current would be supplied to auxiliary motor v not only through wires 11, 54, but also in parallel to them through wires 10, 53 and contacts 17, 18, and the discs or rollers r r r r would be simultaneously moved in the same direction.

lt, however while the single switch of switch a, is thrown in on the righthand side the single switch of switch a were thrown in on the lefthand side magnet q, would again 'be excitcd, but now motor 4) would come to a standstill inasmuch as the connection through contacts 25, 26 and locking-contacts c which are now open, would be interrupted and a connection by way of the contacts 17, 18 could not be established owing to the locking-contacts b being open.

If instead of the single switch of switch a, the group switch is thrown in on the lefthand side, the eontrolling magnet r wiil be excited through wire 4, contact 59, wires 62, 6. 7, 8, and at the same time the controlling magnet q will be excited through wires 4, 61, 63, 64, 7 and 8. Besidcs this the motor 'v will be thrown in :t'or anti-clochwise rotation, phase e, being connected with phase 3 of the system through wires 9, ll, ontact. 20, wires 43, 51, and lower locking-contacts 0 lower locking-contacts e lower lockingcontacts c while the phase v is connected to the phase 2 of the system through wires 52, contact 23, wires 42, 50, and uppcr locking-contacts c upper locking-contacts c upper locking-contacts (1 It' the group switch of switch a, is thrown in on the righthand side, controlling magnets g g, are excited and at the same time motor e is thrown in for clockwise rotation. The flow of current can casiiy he ascertained in accordance with the indications given above.

It is further easy to see that, if several switches, no matter whether they are group switches or single switches, are thrown in simultancously and if all switches connect the motor e; with the system in the same sense the motor will continue rotating, while, if the several switches thrown in simultaneously connect the motor with the system in a different sense and thus cause a short circuit to be established, the motor will be cut of from the system by the locking-contacts b b b and c c, 63,.

Obviously if several group switches or a group switch and a single switch are thrown in smultaneously, wrong connections are rendered impossible by the fact that when the switches are thrown in on the righthand or on the lefthand side, the Contacts 6.3, 66,

` 67, 68, 69, will interrupt the respective connections.

I wish it to be understood that l do not desire to be limited to the exact details of construction, shown and described, for oh vious modifications will occur to a person skilled in the art.

I claim 1. Means for controlling the working speed of motor-driven cooperating machines comprising a separate ditferential gearing operatively connected with each motor and a common drivingdisc arranged to act on all said diferential gears.

2. Means for controlling the working speed of motor-driven cooperating machines comprising a separate diicrentiai gearing tor each machine, one hait ot such gear-ing' being connected with the motor to which it: appertains, and a common diti-ring disc a-ting on the other halves of said ditereutinl gearings.

3. Means for controlling the working speed ot motor-driven. cooperating machines 4 compz'sing e separate difi'erential gearing operative@ connected With each motor, a common driving disc arranged to act on :1 11 said difierential gears and a friction disc operatireiy connected with one of said gearn s, said friction disc being in operative contact With and radially dsplaceable reintive to ?niri driving disc.

4. Menus for controlling the Working speed of motor-driven cooperating machines comprsing a Separate dfierential gearng ope'atively connected with each motor, a common drving means arranged to act on :IN said difl'e'ential gears and means operativo from a distance for Vnrying the rato of Speed transnitted from said driving means to one of said gearings.

5. Means for controiling the Working speed of notor-driven coopernting machines eonprising :i separate diTerenti-al gearing operatively connected with each motor, a common driving means arranged to act On :iii said dfl'ei'entizl ;rears and eiectric means operative froni a' distance for varying the ratio of speed transmitted from said driving means to one of said gearings.

In testimony whereof I nflix my signature PAUL XVETSKE 

